What is with the Hollow Cage Monster that talk to you? "Another nana disappeared, so grandson carries a cage, He ever has his cage. And nana's never coming back. So come into the cage and become nana's shade."

There appears, in the Undead Settlement, to be a Hollow Cage that can be spoken to. He speaks in a singsong manner of another dead nanna, whatever that's supposed to mean.Anybody have any idea of this character's function or significance?